Hi,1. Are you able to stream videos using internet explorer? If no, then do you get any error message?2. Did you make any recent changes on your computer prior to this issue?If the issue is only with Firefox then, I would suggest you to contact the Firefox support team.http://support.mozilla.com/en-US/questionshttp://support.mozilla.com/en-US/homehttp://www.mozilla.com/en-US/about/contact.html